Measurements of ¹²CH₄ν₄ band halfwidths using a tunable diode laser system and a Fourier transform spectrometer

Abstract

Air-broadened and N₂-broadened halfwidths at room temperature for twenty-five transitions in the ν₄ fundamental band of ¹²CH₄ have been determined from IR absorption spectra recorded with a tunable diode laser spectrometer. Two tunable diode lasers operating in the 1250–1380-cm⁻¹ region were used to obtain these data. Air-broadened halfwidths for twenty of these lines were also determined from additional spectra recorded at 0.01-cm⁻¹ resolution with the Fourier transform spectrometer in the McMath solar telescope complex on Kitt Peak. The air-broadened halfwidths obtained from these two techniques are very consistent with agreement better than 3% in most cases.

© 1985 Optical Society of America

Absolute intensities and self-, N₂-, and air-broadened Lorentz halfwidths for selected lines in the ν₃ band of ¹²CH₃D from measurements with a tunable diode laser spectrometer

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